Question

A- Using either “ANDA” or “ORAA” instructions, write an HCS12 code to clear bits 0, 2,5, and 7 of register A and leave all other bits unchanged. B- Using either “ANDB” or “ORAB” instructions, write an HCS12 code to set bits 0, 3, and 6 of register B and leave all other bits unchanged.

Answer 1

ANDA Instruction is used to clear the bits

of register A - ē code to clear bits 0,215,7 Otter bits are cinchanged. A DNOB ET A =0xF3 X ANDA # $50 Perfdoms no operation between the Accumalator content & immediate value 39 A B с о ANDA #$54 A = OXF3 1111 0011 50 og 01011010 101010010 bity bith bith bito tere bt7, bt 5,6tai biro are cleared. by using ANDA instruction Bb code to set bis 01 3,6 of register B. 1. ORAB # $49 A BLA ORB Door- El p= 0X A6 ORAB # 0x4G Be Ox4 =| Стро го 0049 =01001001 TOIII/ bito are set bit's bit3 - Here bitb, bit, bito instruction. ' are ORAB

ORAB instruction is used to set the bits.